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‘What’s in a name? That which we call a rose/By any other name would smell as sweet’ (Juliet, from Romeo and Juliet by William Shakespeare). Shakespeare’s implication is that a name is nothing but a word, and it therefore represents a convention with no intrinsic meaning. While this may be relevant to romantic literature, disease names do have real meanings, and consequences, in medicine. Hence, there must be a very good rationale for changing the name of a disease that has a centuries-old historical context. A working group of representatives from national and international endocrinology, and pediatric endocrine societies now proposes changing the name of ‘diabetes insipidus’ to ‘arginine vasopressin deficiency (AVP-D)’ for central etiologies, and ‘arginine vasopr essin resistance (AVP-R)’ for nephrogenic etiologies. This article provides both the historical context and the rationale for this proposed name change.